Question

Excretory organs of Cockroach are
A. Flame cells
B. Nephridia
C. Green glands
D. Malpighian tubules

Answer 1

Hint: Cockroach belongs to phylum arthropoda, class insecta and to the kingdom Animalia about species of cockroach are found as pests.

Complete Answer:
- The excretory organ in a cockroach is a malpighian tubule. Flame cells are the excretory organs found in simple freshwater invertebrates such as flatworms, rotifers, nemerteans etc.
- Flame cells function exactly like kidneys in removal of waste material. Nephridia are the excretory organs found in earthworms. The body of earthworms is usually segmented. Crustaceans are the arthropods; they have green glands for removal of waste material.
- Since these glands are present near the antenna, they are also called antennal glands. The excretory organ in cockroaches is a malpighian tubule. The body of a cockroach is divided into segments namely head, thorax and abdomen.
- Cockroach is basically nocturnal animal i.e. Active mostly during night. They have a pair of antennae that help them in sensations. On the sides of the body of the cockroach, tiny holes are present for gaseous exchange called spirades.

Therefore, from the above explanation the correct option is (D) Malpighian tubules.

Note: The excretory product in cockroach is liquid or semi-solid material that contains nitrogen which means cockroaches are ammonotelic organs. Uric acid appears in excreta when it is a dietary constituent.